I think you are missing my point.
Here is what I objected to:
"The Protestants believe that satan does God’s will."
Let me make it clear I think both statements are stupid in the absolute sense. A qualifier such as "some" is acceptable.
I agree from a catholic and Apostolic Church's point of view. However, I can't distinguish between so many (thousands) of Protestant denomination and confessions. Chances are that some, perhaps even most Protestant communities, believe in the free will and believe that Satan is a rebellious angel who fell from grace, rather than tow the Judaic line of thinking that angels can't rebel against God and the OT presentation of Satan as a loyal servant of God.
The Problem with any Protestant group is that among them there are always individuals who choose to be Calvinistic in their line of reasoning and still claim their particular denomination.
Case in point: one can be a Southern Baptist and a Calvinist; or Presbyterian and Preterist. Or Methodist and Millenialist, etc. This is because Protestantism is relativistic and its denominations means nothing absolute.
One can be associated with a particular denomination in aprt what other denominations believe and preach. Since every protestant is his or her own 'pope' it is impossible to say "some" Protestant brelieve such and such because it is entirely possible that all of them do.